Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I see you are in Canada. I do not know where, or if you have any of these types of places near enough...
You could try to find some fine gravel that is dark enough. Are you near any cities that have landscapers? Concrete contractors? Swimming pool installers? They probably buy bulk supplies like mulch, gravel, and many other things in stores that specialize in such materials. Swimming pool people may use a product like Pebble Tek. This is a fine quartz, the size of sand, but uniform size, and available in many colors. It is added to the interior coating of swimming pools to make it different colors. Works well in an aquarium, too!
Around here these stores also sell bricks, bagged concrete and all sorts of soils, compost, decorative rock, drain rock and many similar materials. You might look in your local phone book to see if such places are near you. The stores near here will sell the bulk material by the bag as well as by the truckload.
If there are no stores like that near you, you are probably so far out in the country that you could go find a stream that might have some gravel that would work for you.
120 gallon tank will probably need enough gravel that you will want to bring several buckets and a friend to help carry!